/*
 * $Id: Encrypt.java 3271 2008-04-18 20:39:42Z xlv $
 * Copyright (c) 2005-2007 Bruno Lowagie, Carsten Hammer
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * This class was originally published under the MPL by Bruno Lowagie
 * and Carsten Hammer.
 * It was a part of iText, a Java-PDF library. You can now use it under
 * the MIT License; for backward compatibility you can also use it under
 * the MPL version 1.1: http://www.mozilla.org/MPL/
 * A copy of the MPL license is bundled with the source code FYI.
 */

package com.lowagie.toolbox.plugins;

import java.io.File;
import java.io.FileOutputStream;

import javax.swing.JInternalFrame;
import javax.swing.JOptionPane;

import com.lowagie.text.pdf.PdfEncryptor;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.toolbox.AbstractTool;
import com.lowagie.toolbox.arguments.AbstractArgument;
import com.lowagie.toolbox.arguments.BitsetArgument;
import com.lowagie.toolbox.arguments.FileArgument;
import com.lowagie.toolbox.arguments.OptionArgument;
import com.lowagie.toolbox.arguments.StringArgument;
import com.lowagie.toolbox.arguments.filters.PdfFilter;

/**
 * Allows you to encrypt an existing PDF file.
 * @since 2.1.1 (imported from itexttoolbox project)
 */
public class Encrypt extends AbstractTool {

	static {
		addVersion("$Id: Encrypt.java 3271 2008-04-18 20:39:42Z xlv $");
	}
    private final static int PERMISSIONS[] = {
    	PdfWriter.ALLOW_PRINTING,
    	PdfWriter.ALLOW_MODIFY_CONTENTS,
    	PdfWriter.ALLOW_COPY,
    	PdfWriter.ALLOW_MODIFY_ANNOTATIONS,
    	PdfWriter.ALLOW_FILL_IN,
    	PdfWriter.ALLOW_SCREENREADERS,
    	PdfWriter.ALLOW_ASSEMBLY,
    	PdfWriter.ALLOW_DEGRADED_PRINTING};
    private final static String PERMISSION_OPTIONS[] = {
    		"AllowPrinting",
			"AllowModifyContents",
			"AllowCopy",
			"AllowModifyAnnotations",
			"AllowFillIn (128 bit only)",
			"AllowScreenReaders (128 bit only)",
			"AllowAssembly (128 bit only)",
			"AllowDegradedPrinting (128 bit only)"
    		};

	/**
	 * Constructs an Encrypt object.
	 */
	public Encrypt() {
		arguments.add(new FileArgument(this, "srcfile", "The file you want to encrypt", false, new PdfFilter()));
		arguments.add(new FileArgument(this, "destfile", "The file to which the encrypted PDF has to be written", true, new PdfFilter()));
		arguments.add(new StringArgument(this, "ownerpassword", "The ownerpassword you want to add to the PDF file"));
		arguments.add(new StringArgument(this, "userpassword", "The userpassword you want to add to the PDF file"));
		arguments.add(new BitsetArgument(this, "permissions", "Permissions on the file", PERMISSION_OPTIONS));
		OptionArgument oa = new OptionArgument(this, "strength", "Strength of the encryption");
		oa.addOption("40 bit encryption", "40");
		oa.addOption("128 bit encryption", "128");
		arguments.add(oa);
	}

	/**
	 * @see com.lowagie.toolbox.AbstractTool#createFrame()
	 */
	protected void createFrame() {
		internalFrame = new JInternalFrame("Encrypt", true, false, true);
		internalFrame.setSize(300, 80);
		internalFrame.setJMenuBar(getMenubar());
		System.out.println("=== Encrypt OPENED ===");
	}

	/**
	 * @see com.lowagie.toolbox.AbstractTool#execute()
	 */
	public void execute() {
		try {
			if (getValue("srcfile") == null) throw new InstantiationException("You need to choose a sourcefile");
			if (getValue("destfile") == null) throw new InstantiationException("You need to choose a destination file");
			int permissions = 0;
			String p = (String)getValue("permissions");
			if (p != null) {
				for (int k = 0; k < p.length(); ++k) {
					permissions |= (p.charAt(k) == '0' ? 0 : PERMISSIONS[k]);
				}
			}
			byte[] userpassword = null;
			if (getValue("userpassword") != null) {
				userpassword = ((String)getValue("userpassword")).getBytes();
			}
			byte[] ownerpassword = null;
			if (getValue("ownerpassword") != null) {
				ownerpassword = ((String)getValue("ownerpassword")).getBytes();
			}
			PdfReader reader = new PdfReader(((File)getValue("srcfile")).getAbsolutePath());
			PdfEncryptor.encrypt(
        		reader,
				new FileOutputStream((File)getValue("destfile")),
				userpassword,
				ownerpassword,
				permissions,
				"128".equals(getValue("strength"))
				);
		}
		catch(Exception e) {
        	JOptionPane.showMessageDialog(internalFrame,
        		    e.getMessage(),
        		    e.getClass().getName(),
        		    JOptionPane.ERROR_MESSAGE);
            System.err.println(e.getMessage());
		}
	}

    /**
     *
     * @see com.lowagie.toolbox.AbstractTool#valueHasChanged(com.lowagie.toolbox.arguments.AbstractArgument)
     * @param arg StringArgument
     */
    public void valueHasChanged(AbstractArgument arg) {
		if (internalFrame == null) {
			// if the internal frame is null, the tool was called from the command line
			return;
		}
		// represent the changes of the argument in the internal frame
	}

    /**
     * Encrypts an existing PDF file.
     *
     * @param args String[]
     */
    public static void main(String[] args) {
    	Encrypt tool = new Encrypt();
    	if (args.length < 2) {
    		System.err.println(tool.getUsage());
    	}
    	tool.setMainArguments(args);
        tool.execute();
    }

    /**
     *
     * @see com.lowagie.toolbox.AbstractTool#getDestPathPDF()
     * @throws InstantiationException
     * @return File
     */
    protected File getDestPathPDF() throws InstantiationException {
		return (File)getValue("destfile");
	}

}
